This is it ! The mega-merge of the JRA_NMBD_REWRITE branch

back into the main tree.
For the cvs logs of all the files starting nmbd_*.c, look
in the JRA_NMBD_REWRITE branch. That branch has now been
discontinued.
Jeremy.
(This used to be commit d80b0cb645f81d16734929a0b27a91c6650499bb)

1 files changed, 625 insertions, 0 deletions

diff --git a/source3/nmbd/nmbd_incomingdgrams.c b/source3/nmbd/nmbd_incomingdgrams.c
new file mode 100644
index 0000000000..24b4f33838
--- /dev/null
+++ b/source3/nmbd/nmbd_incomingdgrams.c
@@ -0,0 +1,625 @@
+/* 
+   Unix SMB/Netbios implementation.
+   Version 1.9.
+   NBT netbios routines and daemon - version 2
+   Copyright (C) Andrew Tridgell 1994-1997
+   Copyright (C) Luke Kenneth Casson Leighton 1994-1997 
+   Copyright (C) Jeremy Allison 1994-1997
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+   
+*/
+
+#include "includes.h"
+
+extern int DEBUGLEVEL;
+
+extern pstring myname;
+extern fstring myworkgroup;
+
+#if 0
+
+/* XXXX note: This function is currently unsuitable for use, as it
+   does not properly check that a server is in a fit state to become
+   a backup browser before asking it to be one.
+   The code is left here to be worked on at a later date.
+*/
+
+/****************************************************************************
+Tell a server to become a backup browser
+**************************************************************************/
+
+void tell_become_backup(void)
+{
+  struct subnet_record *subrec;
+  for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec))
+  {
+    struct work_record *work;
+    for (work = subrec->workgrouplist; work; work = work->next)
+    {
+      struct server_record *servrec;
+      int num_servers = 0;
+      int num_backups = 0;
+	  
+      for (servrec = work->serverlist; servrec; servrec = servrec->next)
+      {
+        num_servers++;
+	      
+        if (is_myname(servrec->serv.name))
+          continue;
+	      
+        if (servrec->serv.type & SV_TYPE_BACKUP_BROWSER) 
+        {
+          num_backups++;
+          continue;
+        }
+	      
+        if (servrec->serv.type & SV_TYPE_MASTER_BROWSER)
+          continue;
+	      
+        if (!(servrec->serv.type & SV_TYPE_POTENTIAL_BROWSER))
+          continue;
+	      
+        DEBUG(3,("num servers: %d num backups: %d\n", 
+              num_servers, num_backups));
+	      
+        /* make first server a backup server. thereafter make every
+           tenth server a backup server */
+        if (num_backups != 0 && (num_servers+9) / num_backups > 10)
+          continue;
+	      
+        DEBUG(2,("sending become backup to %s %s for %s\n",
+             servrec->serv.name, inet_ntoa(subrec->bcast_ip),
+             work->work_group));
+	      
+        /* type 11 request from MYNAME(20) to WG(1e) for SERVER */
+        do_announce_request(servrec->serv.name, work->work_group,
+              ANN_BecomeBackup, 0x20, 0x1e, subrec->bcast_ip);
+      }
+    }
+  }
+}
+#endif
+
+/*******************************************************************
+  Process an incoming host announcement packet.
+*******************************************************************/
+
+void process_host_announce(struct subnet_record *subrec, struct packet_struct *p, char *buf)
+{
+  struct dgram_packet *dgram = &p->packet.dgram;
+  int ttl = IVAL(buf,1)/1000;
+  char *announce_name = buf+5;
+  uint32 servertype = IVAL(buf,23);
+  char *comment = buf+31;
+  struct work_record *work;
+  struct server_record *servrec;
+  char *work_name;
+  char *source_name = dgram->source_name.name;
+
+  comment[43] = 0;
+  
+  DEBUG(3,("process_host_announce: from %s<%02x> IP %s to \
+%s for server %s.\n", source_name, source_name[15], inet_ntoa(p->ip),
+              namestr(&dgram->dest_name),announce_name));
+
+  DEBUG(5,("process_host_announce: ttl=%d server type=%08x comment=%s\n",
+	   ttl, servertype,comment));
+
+  /* Filter servertype to remove impossible bits. */
+  servertype &= ~(SV_TYPE_LOCAL_LIST_ONLY|SV_TYPE_DOMAIN_ENUM);
+
+  /* A host announcement must be sent to the name WORKGROUP<1d>. */
+  if(dgram->dest_name.name_type != 0x1d)
+  {
+    DEBUG(2,("process_host_announce: incorrect name type for destination from IP %s \
+(was %02x) should be 0x1d. Allowing packet anyway.\n",
+              inet_ntoa(p->ip), dgram->dest_name.name_type));
+    /* Change it so it was. */
+    dgram->dest_name.name_type = 0x1d;
+  }
+
+  /* For a host announce the workgroup name is the destination name. */
+  work_name = dgram->dest_name.name;
+
+  /*
+   * We are being very agressive here in adding a workgroup
+   * name on the basis of a host announcing itself as being
+   * in that workgroup. Maybe we should wait for the workgroup
+   * announce instead ? JRA.
+   */
+
+  if ((work = find_workgroup_on_subnet(subrec, work_name))==NULL)
+  {
+    /* We have no record of this workgroup. Add it. */
+    if((work = create_workgroup_on_subnet(subrec, work_name, ttl))==NULL)
+      return;
+  }
+  
+  if((servrec = find_server_in_workgroup( work, announce_name))==NULL)
+  {
+    /* If this server is not already in the workgroup, add it. */
+    create_server_on_workgroup(work, announce_name, 
+                               servertype|SV_TYPE_LOCAL_LIST_ONLY, 
+                               ttl, comment);
+  }
+  else
+  {
+    /* Update the record. */
+    servrec->serv.type = servertype|SV_TYPE_LOCAL_LIST_ONLY;
+    update_server_ttl( servrec, ttl);
+    StrnCpy(servrec->serv.comment,comment,sizeof(servrec->serv.comment)-1);
+  }
+
+  subrec->work_changed = True;
+}
+
+/*******************************************************************
+  Process an incoming WORKGROUP announcement packet.
+*******************************************************************/
+
+void process_workgroup_announce(struct subnet_record *subrec, struct packet_struct *p, char *buf)
+{
+  struct dgram_packet *dgram = &p->packet.dgram;
+  int ttl = IVAL(buf,1)/1000;
+  char *workgroup_announce_name = buf+5;
+  uint32 servertype = IVAL(buf,23);
+  char *master_name = buf+31;
+  struct work_record *work;
+  char *source_name = dgram->source_name.name;
+
+  master_name[43] = 0;
+
+  DEBUG(3,("process_workgroup_announce: from %s<%02x> IP %s to \
+%s for workgroup %s.\n", source_name, source_name[15], inet_ntoa(p->ip),
+              namestr(&dgram->dest_name),workgroup_announce_name));
+
+  DEBUG(5,("process_workgroup_announce: ttl=%d server type=%08x master browser=%s\n",
+           ttl, servertype, master_name));
+
+  /* Workgroup announcements must only go to the MSBROWSE name. */
+  if (!strequal(dgram->dest_name.name, MSBROWSE) || (dgram->dest_name.name_type != 0x1))
+  {
+    DEBUG(0,("process_workgroup_announce: from IP %s should be to __MSBROWSE__<0x01> not %s\n",
+              inet_ntoa(p->ip), namestr(&dgram->dest_name)));
+    return;
+  }
+
+  if ((work = find_workgroup_on_subnet(subrec, workgroup_announce_name))==NULL)
+  {
+    /* We have no record of this workgroup. Add it. */
+    if((work = create_workgroup_on_subnet(subrec, workgroup_announce_name, ttl))==NULL)
+      return;
+  }
+  else
+  {
+    /* Update the workgroup death_time. */
+    update_workgroup_ttl(work, ttl);
+  }
+
+  if(*work->local_master_browser_name == '\0')
+  {
+    /* Set the master browser name. */
+    StrnCpy(work->local_master_browser_name, master_name,
+            sizeof(work->local_master_browser_name)-1);
+
+  }
+
+  subrec->work_changed = True;
+}
+
+/*******************************************************************
+  Process an incoming local master browser announcement packet.
+*******************************************************************/
+
+void process_local_master_announce(struct subnet_record *subrec, struct packet_struct *p, char *buf)
+{
+  struct dgram_packet *dgram = &p->packet.dgram;
+  int ttl = IVAL(buf,1)/1000;
+  char *server_name = buf+5;
+  uint32 servertype = IVAL(buf,23);
+  char *comment = buf+31;
+  char *work_name;
+  struct work_record *work;
+  struct server_record *servrec;
+  char *source_name = dgram->source_name.name;
+
+  comment[43] = 0;
+
+  DEBUG(3,("process_local_master_announce: from %s<%02x> IP %s to \
+%s for server %s.\n", source_name, source_name[15], inet_ntoa(p->ip),
+              namestr(&dgram->dest_name),server_name));
+
+  DEBUG(5,("process_local_master_announce: ttl=%d server type=%08x comment=%s\n",
+           ttl, servertype, comment));
+
+  /* A local master announcement must be sent to the name WORKGROUP<1e>. */
+  if(dgram->dest_name.name_type != 0x1e)
+  {
+    DEBUG(0,("process_local_master_announce: incorrect name type for destination from IP %s \
+(was %02x) should be 0x1e. Ignoring packet.\n",
+              inet_ntoa(p->ip), dgram->dest_name.name_type));
+    return;
+  }
+
+  /* Filter servertype to remove impossible bits. */
+  servertype &= ~(SV_TYPE_LOCAL_LIST_ONLY|SV_TYPE_DOMAIN_ENUM);
+
+  /* For a local master announce the workgroup name is the destination name. */
+  work_name = dgram->dest_name.name;
+
+  if ((work = find_workgroup_on_subnet(subrec, work_name))==NULL)
+  {
+    /* We have no record of this workgroup. Add it. */
+    if((work = create_workgroup_on_subnet(subrec, work_name, ttl))==NULL)
+      return;
+  }
+
+  /* If we think we're the local master browser for this workgroup,
+     we should never have got this packet. We don't see our own
+     packets.
+   */
+  if(AM_LOCAL_MASTER_BROWSER(work))
+  {
+    DEBUG(0,("process_local_master_announce: Server %s at IP %s is announcing itself as \
+a local master browser for workgroup %s and we think we are master. Forcing election.\n",
+      server_name, inet_ntoa(p->ip), work_name));
+
+    /* Samba nmbd versions 1.9.17 to 1.9.17p4 have a bug in that when
+       they have become a local master browser once, they will never
+       stop sending local master announcements. To fix this we send
+       them a reset browser packet, with level 0x2 on the __SAMBA__
+       name that only they should be listening to. */
+   
+    send_browser_reset( 0x2, "__SAMBA__" , 0x20, p->ip);
+
+    /* We should demote ourself and force an election. */
+
+    unbecome_local_master_browser( subrec, work);
+
+    /* The actual election requests are handled in
+       nmbd_election.c */
+
+    work->needelection = True;
+    return;
+  }  
+
+  /* Find the server record on this workgroup. If it doesn't exist, add it. */
+
+  if((servrec = find_server_in_workgroup( work, server_name))==NULL)
+  {
+    /* If this server is not already in the workgroup, add it. */
+    create_server_on_workgroup(work, server_name, 
+                               servertype|SV_TYPE_LOCAL_LIST_ONLY, 
+                               ttl, comment);
+  }
+  else
+  {
+    /* Update the record. */
+    servrec->serv.type = servertype|SV_TYPE_LOCAL_LIST_ONLY;
+    update_server_ttl(servrec, ttl);
+    StrnCpy(servrec->serv.comment,comment,sizeof(servrec->serv.comment)-1);
+  }
+
+  /* Set the master browser name. */
+  StrnCpy(work->local_master_browser_name, server_name,
+            sizeof(work->local_master_browser_name)-1);
+
+  subrec->work_changed = True;
+}
+
+/*******************************************************************
+  Process a domain master announcement frame.
+  Domain master browsers receive these from local masters. The Domain
+  master should then issue a sync with the local master, asking for
+  that machines local server list.
+******************************************************************/
+
+void process_master_browser_announce(struct subnet_record *subrec, 
+                                     struct packet_struct *p,char *buf)
+{
+  char *local_master_name = buf;
+  struct work_record *work;
+  struct browse_cache_record *browrec;
+
+  local_master_name[15] = 0;
+  
+  DEBUG(3,("process_master_browser_announce: Local master announce from %s IP %s.\n",
+           local_master_name, inet_ntoa(p->ip)));
+  
+  if (!lp_domain_master()) 
+  {
+    DEBUG(0,("process_master_browser_announce: Not configured as domain \
+master - ignoring master announce.\n"));
+    return;
+  }
+  
+  if((work = find_workgroup_on_subnet(subrec, myworkgroup)) == NULL)
+  {
+    DEBUG(0,("process_master_browser_announce: Cannot find workgroup %s on subnet %s\n",
+           myworkgroup, subrec->subnet_name));
+    return;
+  }
+
+  if(!AM_DOMAIN_MASTER_BROWSER(work))
+  {
+    DEBUG(0,("process_master_browser_announce: Local master announce made to us from \
+%s IP %s and we are not a domain master browser.\n", local_master_name, inet_ntoa(p->ip)));
+    return;
+  }
+
+  /* Add this host as a local master browser entry on the browse lists.
+     This causes a sync request to be made to it at a later date.
+   */
+
+  if((browrec = find_browser_in_lmb_cache( local_master_name )) == NULL)
+  {
+    /* Add it. */
+    create_browser_in_lmb_cache( work->work_group, local_master_name, p->ip);
+  }
+  else
+    update_browser_death_time(browrec);
+}
+
+/****************************************************************************
+  Send a backup list response.
+*****************************************************************************/
+
+static void send_backup_list_response(struct subnet_record *subrec, 
+                             struct work_record *work,
+                             struct nmb_name *send_to_name,
+                             unsigned char max_number_requested,
+			     uint32 token, struct in_addr sendto_ip)
+{                     
+  char outbuf[1024];
+  char *p, *countptr, *nameptr;
+  int count = 0;
+  int len;
+  struct server_record *servrec;
+
+  bzero(outbuf,sizeof(outbuf));
+
+  DEBUG(3,("send_backup_list_response: sending backup list for workgroup %s to %s IP %s\n",
+	   work->work_group, namestr(send_to_name), inet_ntoa(sendto_ip)));
+  
+  p = outbuf;
+  
+  SCVAL(p,0,ANN_GetBackupListResp); /* Backup list response opcode. */
+  p++;
+
+  countptr = p;
+  p++;
+
+  SIVAL(p,0,token); /* The sender's unique info. */
+  p += 4;
+  
+  nameptr = p;
+
+  /* We always return at least one name - our own. */
+  count = 1;
+  StrnCpy(p,myname,15);
+  strupper(p);
+  p = skip_string(p,1);
+
+  /* Look for backup browsers in this workgroup. */
+  for (servrec = work->serverlist; servrec; servrec = servrec->next)
+  { 
+    len = PTR_DIFF(p, outbuf);
+    if((sizeof(outbuf) - len) < 16)
+      break;
+
+    if(count >= max_number_requested)
+      break;
+
+    if(strnequal(servrec->serv.name, myname,15))
+      continue;
+
+    if(!(servrec->serv.type & SV_TYPE_BACKUP_BROWSER))
+      continue;
+
+    StrnCpy(p, servrec->serv.name, 15);
+    strupper(p);
+    count++;
+
+    DEBUG(5,("send_backup_list_response: Adding server %s number %d\n",
+              p, count));
+
+    p = skip_string(p,1);
+  }
+
+  SCVAL(countptr, 0, count);
+
+  len = PTR_DIFF(p, outbuf);
+
+  DEBUG(4,("send_backup_list_response: sending response to %s<00> IP %s with %d servers.\n",
+          send_to_name->name, inet_ntoa(sendto_ip), count));
+
+  send_mailslot(True, BROWSE_MAILSLOT,
+                outbuf,PTR_DIFF(p,outbuf),
+                myname, 0, 
+                send_to_name->name,0,
+                sendto_ip, subrec->myip);
+}
+
+/*******************************************************************
+  Process a send backup list request packet.
+
+  A client sends a backup list request to ask for a list of servers on
+  the net that maintain server lists for a domain. A server is then
+  chosen from this list to send NetServerEnum commands to to list
+  available servers.
+
+********************************************************************/
+
+void process_get_backup_list_request(struct subnet_record *subrec,
+                                     struct packet_struct *p,char *buf)
+{
+  struct dgram_packet *dgram = &p->packet.dgram;
+  struct work_record *work;
+  unsigned char max_number_requested = CVAL(buf,0);
+  uint32 token = IVAL(buf,1); /* Sender's key index for the workgroup. */
+  int name_type = dgram->dest_name.name_type;
+  char *workgroup_name = dgram->dest_name.name;
+
+  DEBUG(3,("process_get_backup_list_request: request from %s IP %s to %s.\n",
+           namestr(&dgram->source_name), inet_ntoa(p->ip),
+           namestr(&dgram->dest_name)));
+  
+  /* We have to be a master browser, or a domain master browser
+     for the requested workgroup. That means it must be our
+     workgroup. */
+
+  if(strequal(workgroup_name, myworkgroup) == False)
+  {
+    DEBUG(7,("process_get_backup_list_request: Ignoring announce request for workgroup %s.\n",
+           workgroup_name));
+    return;
+  }
+
+  if((work = find_workgroup_on_subnet(subrec, workgroup_name)) == NULL)
+  {
+    DEBUG(0,("process_get_backup_list_request: Cannot find workgroup %s on \
+subnet %s.\n", workgroup_name, subrec->subnet_name));
+    return;
+  }
+
+  if(name_type == 0x1b)
+  {
+    /* We must be a domain master browser in order to
+       process this packet. */
+
+    if(!AM_DOMAIN_MASTER_BROWSER(work))
+    {
+      DEBUG(0,("process_get_backup_list_request: domain list requested for workgroup %s \
+and I am not a domain master browser.\n", workgroup_name));
+      return;
+    }
+  }
+  else if (name_type == 0x1d)
+  {
+    /* We must be a local master browser in order to
+       process this packet. */
+
+    if(!AM_LOCAL_MASTER_BROWSER(work))
+    {
+      DEBUG(0,("process_get_backup_list_request: domain list requested for workgroup %s \
+and I am not a local master browser.\n", workgroup_name));
+      return;
+    }
+  }
+  else
+  {
+    DEBUG(0,("process_get_backup_list_request: Invalid name type %x - should be 0x1b or 0x1d.\n",
+            name_type));
+    return;
+  }
+
+  send_backup_list_response(subrec, work, &dgram->source_name, 
+                            max_number_requested, token, p->ip);
+}
+
+/*******************************************************************
+  Process a reset browser state packet.
+
+  Diagnostic packet:
+  0x1 - Stop being a master browser and become a backup browser.
+  0x2 - Discard browse lists, stop being a master browser, try again.
+  0x4 - Stop being a master browser forever.
+         
+******************************************************************/
+
+void process_reset_browser(struct subnet_record *subrec,
+                                  struct packet_struct *p,char *buf)
+{
+  struct dgram_packet *dgram = &p->packet.dgram;
+  int state = CVAL(buf,0);
+  struct subnet_record *sr;
+
+  DEBUG(1,("process_reset_browser: received diagnostic browser reset \
+request from %s IP %s state=0x%X\n",
+             namestr(&dgram->source_name), inet_ntoa(p->ip), state));
+
+  /* Stop being a local master browser on all our broadcast subnets. */
+  if (state & 0x1)
+  {
+    for (sr = FIRST_SUBNET; sr; sr = NEXT_SUBNET_EXCLUDING_UNICAST(sr))
+    {
+      struct work_record *work;
+      for (work = sr->workgrouplist; work; work = work->next)
+      {
+        if (AM_LOCAL_MASTER_BROWSER(work))
+        {
+          unbecome_local_master_browser(sr, work);
+          work->needelection = True;
+        }
+      }
+    }
+  }
+  
+  /* Discard our browse lists. */
+  if (state & 0x2)
+  {
+    /*
+     * Calling expire_workgroups_and_servers with a -1
+     * time causes all servers not marked with a PERMANENT_TTL
+     * on the workgroup lists to be discarded, and all 
+     * workgroups with empty server lists to be discarded.
+     * This means we keep our own server names and workgroup
+     * as these have a PERMANENT_TTL.
+     */
+
+    expire_workgroups_and_servers(-1);
+  }
+  
+  /* Request to stop browsing altogether. */
+  if (state & 0x4)
+    DEBUG(1,("process_reset_browser: ignoring request to stop being a browser.\n"));
+}
+
+/*******************************************************************
+  Process a announcement request packet.
+  We don't respond immediately, we just check it's a request for
+  out workgroup and then set the flag telling the announce code
+  in nmbd_sendannounce.c:announce_my_server_names that an 
+  announcement is needed soon.
+  ******************************************************************/
+
+void process_announce_request(struct subnet_record *subrec, struct packet_struct *p, char *buf)
+{
+  struct dgram_packet *dgram = &p->packet.dgram;
+  struct work_record *work;
+  char *workgroup_name = dgram->dest_name.name;
+ 
+  DEBUG(3,("process_announce_request: Announce request from %s IP %s to %s.\n",
+           namestr(&dgram->source_name), inet_ntoa(p->ip),
+           namestr(&dgram->dest_name)));
+  
+  /* We only send announcement requests on our workgroup. */
+  if(strequal(workgroup_name, myworkgroup) == False)
+  {
+    DEBUG(7,("process_announce_request: Ignoring announce request for workgroup %s.\n",
+           workgroup_name));
+    return;
+  }
+
+  if((work = find_workgroup_on_subnet(subrec, workgroup_name)) == NULL)
+  {
+    DEBUG(0,("process_announce_request: Unable to find workgroup %s on subnet !\n",
+            workgroup_name));
+    return;
+  }
+
+  work->needannounce = True;
+}